Evaluation of different methods of determining the angle of attack on wind turbine blades under yawed inflow conditions
K. Vimalakanthan (ECN Solar Energy)
J. G. Schepers (ECN Solar Energy)
W. Z. Shen (Technical University of Denmark (DTU))
H. Rahimi (University of Oldenburg, Fraunhofer Institute for Wind Energy Systems (IWES))
D. Micallef (University of Malta)
C. J. Simao Ferreira (TU Delft - Wind Energy)
E. Jost (University of Stuttgart)
L. Klein (University of Stuttgart)
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Abstract
As part of the AVATAR and Mexnext projects, this study compares several methods used to derive lifting line variables from CFD simulations of the MEXICO rotor in yawed inflow. The results from six partners within the AVATAR/Mexnext consortium using five different methods of extraction were compared. Overall comparison of the induced velocities at the mid and tip parts of blade shows fairly good agreement between the tested methods, where the derived angle of attack differs within 1°, within the linear range this accounts to 10% uncertainty on the aerodynamic forces. The presented comparison shows inadequate agreement between the methods for application towards the root.
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